Corner plumb



Aug. 16, 1966 ca. STAUB 3,266,155

CORNER PLUMB Filed Sept. 25, 1964 5 Sheets-Sheet 1 INVENTOR.

GOTTFiRyIEgII STAUB Y M ATTORNEYS G. STAUB CORNER PLUMB Aug. 16, 1966 :3 Sheets-Sheet 2 Filed Sept. 25. 1964 INVENTOR. GOTTFRl/g) STAUB BY A. .71%

ATTORNEYS Aug. 16, 1966 G. STAUB 3,266,155

CORNER PLUMB Filed Sept. 25, 1964 5 Sheets-Sheet 3 INVENTOR.

GOTTFRIED STAUB BYQ ML ATTORNEYS United States Patent 3,266,155 CURNER TLtlMB Gottfried Staph, 2%66 Kingston Drive, li ladison, Wis. Filed dept. 25, race, fier. No. 399,172 6 Qllaims. (Ell. Ki -35) This invention relates to improvements in corner plumbs used in the building industry by brioklayers, stone masons, and other skilled laborers for making vertically true corner joints.

It is a primary object of the present invention to provide an efficient and effective device for use by bricklayers and stone masons in constructing and maintaining vertically plumb corners.

It is a further object of the present invention to provide a corner plumb that allows the corners and walls of a structure to be simultaneously constructed in one continuous operation, thereby reducing the tendency for cracks to form therein.

It is an additional object of the present invention to provide a corner plumb that may be quickly and accurately attached to any corner of a brick or stone structure and leveled.

It is another object of the present invention to provide a simple and inexpensive device for use in constructing vertical walls at right angles to each other.

Other objects and advantages of this invention will be readily apparent from the following detailed description taken in conjunction with the accompanying drawings wherein preferred embodiments of the principles of the I invention have been selected for exemplification.

FIG. 1 is a perspective view of my corner plumb showing it as it is used during the construction of a brick wall.

FIG. 2 is a partial section View of my corner plumb taken along section line 2-2 of FIG. 1.

FIG. 3 is a partial front view of the corner plumb of my invention shown in FIGS. 1 and 2.

FIG. 4 is a partial perspective view of my corner plumb illustrating another embodiment of the bracket of my invention.

FIG. 5 is a perspective view of another embodiment of my corner plumb as it is used during construction of a brick wall.

FIG. 6 is a partial section view taken along section line 6-6 of FIG. 5.

FIG. 7 is a partial front view of the embodiment of my invention shown in FIGS. 5 and 6.

FIG. 8 is a side view of the bracket shown in FIG. 7.

FIG. 9 is a partial section view showing a modified bracket of my invention.

FIG. 10 is a side View of the combination straight edge anrd level indicator means employed in the embodiment of FIG. 5.

FIG. 11 is a partial section view illustrating an additional embodiment of my invention taken along a section line lying in the same plane as section line 66 of FIG. 5.

FIG. 12 is a partial front view of a corner guide of my invention.

FIG. 13 is a partial section view taken along section line 13-13 of FIG. 1.

Each embodiment of my novel corner plumb is preferably composed of the following basic elements: a straight edge; one or more brackets adapted to hold the straight edge in a vertical position flush with the corner of a masonry structure; attachment means for demountably securing the brackets to the corner; and indicator means for determining whether the straight edge is plumb.

FIGS. 1-4 show a preferred embodiment 2d of my corner plumb. The brackets 21 of my preferred corner plumb 213 are adapted to engage two adjacent sides 22a and 2-27) of a straight edge 22 having a rectangular cross section in substantially flush relation, and to support the straight edge in substantially plumb relation. When so positioned, the side 22b of the straight edge 22 is aligned with one surface 25 of the wall 13 being constructed, and the lower end of the other adjacent side 22c is held against surface 23 of the wall 18 in substantially flush relation. The straight edge 22 extends vertically upward from the wall 18 to provide a guide for succeeding layers of bricks 19 or blocks as construction of the wall 13 progresses.

Each bracket 21 includes a channel 26 adapted to receive the straight edge 22 as shown in FIG. 2, and two end portions 27 and 23. The size of the channel 26 will depend upon the dimensions of the straight edge 22 with which it is to be used. The channel 26 includes a base portion 29 and two arm portions 30 and 3:1. The base portion of the channel 26 is slightly longer than the longer sides 22:: and 22c of the straight edge 22, and the two arm portions 30 and 31 should be no longer than the width of the straight edge short sides 22b and 22d. When the straight edge is engaged in the channel 26 in use, the base portion 29 of the channel engages straight edge side 22a and the channel arm portion 30 engages straight edge side 2 2d in substantially flush relation as described above. A spring 32 is preferably attached to the inside surface of channel side portion. 3-1 to help secure the straight edge 22 within the channel 26. The spring 32 exerts a force against short side 22d of the straight edge 22, thereby pushing the other parallel short side 22b against the inside surface of the opposite anm 3d of the channel 26 in substantially flush relation. FIG. 2 shows a leaf spring 32 attached to the inside surface of the channel 26. However, any spring means which may be adapted to exert pressure on the straight edge 22 may be used.

The two end portions 2'7 and 28 of bracket 21 are continuations of arms 30 and 31 of the channel 26. The first end portion 27 extends from arm 30 in the same plane as arm 30, and is adapted to bear against one outside vertical face of a brick 19 or block forming a portion of a square corner 2 of the wall 18 being constructed. The second end portion 28 of bracket 21 preferably extends from arm 31 of the channel 26 at right angles thereto, and at right angles to the first end portion 27, and is adapted to bear against the other outside vertical face of such a brick 19 or block when arm 31 is the same length as the straight edge short side 22d, as shown. If the width of the short side 22d is greater than the length of the arm 31, the bracket second end portion 28 will not engage the brick 19.

A spring loaded blade 34, two possible forms of which are best shown in FIGS. 2 and 4, preferably provides the means for attaching the bracket 21 to the brick 19 or block forming a portion of the corner 24 of the wall 18. The spring loaded blade 34 may be pivotally attached by any suitable means such as hinge 39 to the second end portion 28 of the bracket 21 such that it extends from the second end portion 28 approximately parallel to and in the same direction as the first end portion. 27. Spring means 34a are provided to continuously urge the end of the blade 34 opposite the first end portion 27 toward said first end portion 27 to permit the bracket 21 to removably engage a brick 19 or block located therebetween in the manner illustrated in FIG. 2. The spring loaded blade 34 is adapted to extend into the vertical mortar joint 33 between adjacent bricks 19 or blocks forming the wall. The force of the spring means 34a against the blade 34- ma'intains the first end portion 27 flush against the opposite surface 25 of the wall 18. In this position, the bracket 21 will support the straight edge 22 such that side 22]) is in alignment with wall surface and side 22c is flush against wall surface 23, as shown in FIG. 2. It is obvious that since the opposite sides of the straight edge 22 are parallel, it may be inverted or rotated so that side 22d is maintained in alignment with surface 23 of the wall. The blade 34 also preferably extends forwardly from the wall 18, as shown, to form a handle member 37 of any desired shape to facilitate pivoting the blade 34 about the hinge 39 against the force of the spring means 34a to engage and disengage the brick 19 or block.

To insure that the straight edge 22 is supported in vertical or plumb relation, level indicator means must be provided on the brackets 21 or the straight edge 22. FIGS. 1-4 illustrate one such preferred means which comprises a pair of conventional horizontal bubble level indicators 35 and 36 attached to the outer side of the channel 26 of the upper bracket 21. If desired, such level indicators may be secured to the lower bracket 21 rather than the upper bracket. indicators 36 is preferably secured to the outer surface of the channel base portion 29, and the other said bubble level indicator 35 is preferably secured to the outer surface of one of said channel side portions 311 or 31. The bubble level indicators should be so secured that level indicator 36 will lie perpendicular to the inside surface of channel side portion 31), and level indicator 35 will lie perpendicular to the inside surface of channel base portion 29. Thus, when indicator 36 is level, the side of the straight edge 22 which is flush against the inside surface of channel side portion will lie in a vertical plane. When indicator is level, the side of the straight edge which lies flush against the channel base portion 29 will lie in a vertical plane. When both indicators 35 and 36 are level, all four sides of the straight edge 22 will lie in a vertical plane, and the straight edge 22 will be plumb. The corner 24 of the wall 18 may then be extended upwardly to the height of the upper end of the straight edge 22, using the straight edge 22 as a guide. If wall surface 25 is maintained in alignment with the side 2212 of the straight edge in abutment with channel side portion 30, and if the wall surface 23 is constructed flush with the adjacent side 22a of the straight edge, the wall surfaces 25 and 26 and corner 24 will be plumb.

In FIGS. 1-3, the horizontal bubble level indicators 35 and 36 are shown permanently secured directly to the outside surface of the channel 26 by any suitable means. In FIG. 4, the level indicators 35 and 36 are seen to be secured to a detachable corner plate 41. Corner plate 41 is adapted to fit flush against the outside surfaces of channel base portion 29 and side portion 30 such that level indicators 35 and 36 are perpendicular to said channel base and side portions 29 and 31], respectively. The corner plate 41 may preferably have an alignment hole 42 adapted to receive alignment pins extending outwardly from channel side portion 311 to help maintain the corner plate 41 in the desired position on the channel 26. The corner plate 41 is preferably maintained in engagement with the channel 26 by means of an extension spring 43 extending from level indicator 36 and a clip 43a attached to the spring 43 and adapted to engage side portion 31 of the channel 26. The spring 43 urges the corner plate 41 into tight engagement with side portion 30 of the channel 26, and substantially prevents removal of the plate 41 until the clip 43a is disengaged from side portion 31. Thus, the corner plate 41 and attached level indicators 35 and 36 may be easily secured to and removed from any bracket 21 of the corner plumb 20. It is also apparent that the corner plate 41 with attached level indicators 35 and 36 shown in FIG. 4 could be attached directly to a straight edge 22 in the same manner as it is attached to the bracket channel 26.

Another preferred type of indicator means is illustrated in FIGS. 5 and 8, and comprises a plurality of bubble level indicators 49 and located within the straight edge.

One of said bubble level 4- In the illustrated embodiment, level 44 having a plurality of bubble level indicators 49 and 519 is employed as the straight edge element of my corner plumb 20. Such a level 4d should preferably have a suflicient number of level indicators 49 and 51b to plumb the level 4-4 regardless of which end of the level 44 is uppermost. In the illustrated level 44, level indicators 49 lie in a plane perpendicular to one side of the level, and level indicators 5t) lie in a plane perpendicular to an adjacent side of the level and at right angles to the plane of level indicators 49. When such a level is employed as the straight edge element of my invent-ion, it is unnecessary to have bubble indicators such as those shown in FIGS. 1-4 secured to the brackets holding the straight edge element. Correspondingly, if such bubble level indicators 35' and 36 are secured to the brackets supporting the straight edge, it is not necessary for the straight edge to include such indicators.

My entire corner plumb 20 may be detached from the wall 13 simply by forcing the blade handle member 37 of each bracket 21 toward the channel 26 of the bracket 21 to force the blade 34 and the first end portion 27 apart against the action of the springs 34a. The brackets 21 may then be disengaged from the bricks 19 or blocks and removed with the straight edge 22 from the wall corner 24. My corner plumb 20 may thus be easily moved up the wall 18 as construction progresses, or it may be readily moved to another corner of the wall as needed.

FIGS. 58 also illustrate a modified bracket 21a which may be employed in my invention. The bracket 21a of FIGS. 58 differs from the bracket 21 of FIGS. 1-4 primarily in that the second end portion is repositioned to extend in a continuous manner from the base portion 29 of the channel 26 to form a hinge plate 45. The second end portion or hinge plate 45 of FIGS. 58 and the base portion 29 together are preferably slightly longer than the adjacent side of the brick 19 or block to which the bracket 21a is to be attached. The hinge plate 45 preferably has an approximately rectangular opening 4-6 near its free end 45a as shown. A blade 4-7 having a neck portion 47a and a handle 47]) extends through said opening 46 with the neck portion 47a in communication therewith. As shown in FIGS. 7 and 8, the neck portion 47a is narrow enough to slide laterally within the opening 46. The blade handle 47b and the body of the blade 47 are wider than the vertical dimension of the opening 46, and are preferably spaced apart by the neck portion 47a only enough to permit the neck portion 47a to slide laterally within the opening 46 when the blade 47 is substan tially perpendicular to the hinge plate 45. When the blade 47 extends from the hinge plate 45 at an angle appreciably less than the facing portions of the handle 47b and the body of the blade 47 will grip the hinge plate to prevent sliding of the neck portion 47a within the opening 46.

FIG. 9 illustrates a modification of bracket 21a wherein the blade 47 is pivotally attached to the end 45a of the hinge plate 45 by means of hinge 39a.

Spring means such as an extension spring 48 extend between the channel side portion 31 and the blade 47 to urge the body of the blade 47 toward the bracket end portion 27, to engage a brick 19 or block therebetween. Attachment and detachment of bracket 21a to and from a brick 19 or block partially defining a wall corner 24 is essentially the same as that described above with respect to bracket 21. When the bracket 21a is attached as shown in FIGS. 58, the straight edge or level 44 supported by the brackets 21a will be positioned such that one side of the level 44 will be in alignment with surface 25 of the Wall 18, and an adjacent side of the level will be flush against surface 23 of the wall.

If the level 44 has a sufficient number of bubble level indicators 49 and 59 located and positioned therein so that the level 4 may be easily plumbed regardless of which end of the level 44 extends upwardly, then no 3,aee,155

bubble level indicators need be secured to the brackets 21a for the purpose of plumbing the level 44. If not, or if a straight edge similar to straight edge 22 of FIGS. 1-4 is employed with brackets 21a, then bubble level indicators 35 and 36 should be secured to the brackets 21a or straight edge 22 as described above to facilitate plumbing the straight edge or level 44. As stated above, level indicators 49 and 50 of level 44 lie in perpendicular planes so that the level 44 may be plumbed in perpendicular planes to insure that it will be plumb in all planes.

A scale 53, illustrated in FIG. 10, may preferably be mounted on at least one side of the level 44 or straight edge 22, and preferably on opposite sides running from opposite ends, to indicate the heights of different courses of brick 19 or blocks forming the wall 18 under construction. The scale 53 preferably consists of a plurality of spaced parallel line groupings. In the illustrated scale 53, six lines make up each group of lines. The second line 54 in each group, as counted from the bottom line, may extend completely across the side of the level 44, and each of said second lines 54 is spaced 2% inches from the next SUCh second line 54, 2% inches being the standard height for a conventional brick and one course of mortar. Each line within the first or lowest group 55 is spaced V of an inch apart; each line within the second group 56 is spaced %4 or A of an inch apart; each line within the third group 57 is spaced 5 or /8 of an inch apart; etc. This means that the individual lines within each consecutive group of lines are spaced of an inch farther apart than the next lower group of lines. By this unique method of marking the level 44 the bricklayer or stone mason can easily determine how many courses of brick are needed to reach a certain given height, and how thick each course of mortar should be to provide equal spacing between the courses of brick. Thus, if the top of the third course of bricks is to be 8 inches from the base of the wall, the top of each course of bricks should be level with the second line 54 of each group of lines 55, 56 and 57, respectively, to achieve the desired spacing. If the top of the third course of bricks is to be only 7 /8 inches above the base, the top of each course of bricksshould be level with the bottom line of each group. If the top of the fourth course of bricks is to be 11 inches above the base, the second line above line 54 in each group will be the reference line, and so forth.

FIGS. 6 and 7 also show a rigid pin 38 extending partially across the lower end of the opening defined by the channel 26. The upper surface of the pin 38 is even with the bottom of the blade 47 and the bottom of the bracket first end portion 27 to define the level of the straight edge 22 or level 44 supported in the channel 26. When the bottoms of the blade 47 and the first end portion 27 are level with the top of the brick 19 immediately below the brick to which the bracket 21a is attached, the bottom of the straight edge orscale will be even with the top of the brick 19 also. T he pin 38 may be of any shape or size, and may extend from any side of the channel 26. It will only be present on the lower bracket of my invention, as its presence on the upper bracket would prevent the passage therethrough of a straight edge or level. It, of course, can be included with any bracket illustrated or described herein. Use of the pin 38 is especially desirable when the straight edge or level includes a scale for determining the height of the courses of brick and mortar.

FIG. 11 shows another embodiment of my invention. The bracket 21b of FIG. 11 is substantially similar to bracket 21 of FIGS. 1-4 except that the channel 26b has a rear portion 58 in addition to the base portion 29 and side portions 30 and 31 of channel 26. The four-sided channel 26b isadapted to receive the straight edge 22 or level 44, as shown, and supports it in a vertical position with one side thereof in alignment with surface 25 of the wall 18, and an adjacent side parallel and adjacent to surface 23 of the wall. The rear portion 58 of the bracket 26b rests against surface 23 of the wall when the bracket 21b is attached thereto, and the base portion 2% holds the straight edge 22 or level 44 against the rear portion 53. The base portion 29b of the four-sided bracket 21b may be movable by any suitable means or may employ spring means similar to spring 32 shown in FIGS. 2 and 6 to maintain the straight edge 22 or level 44 against the rear portion 58, or to adjust to different sized straight edges or levels. The first end portion 27 of bracket 21b is similar to those of the previously described embodiments. The second end portion 28 is similarto the second end portion of bracket 21 illustrated in FIGS. 1 through 3, and is continuous with and lies in the same plane as the front side 58 of the four-sided bracket 21b. A spring-loaded blade 34b demountably secures the bracket 21b to the Wall 13 and is generally similar to the spring attachment means illustrated in FIGS. 1 through 3. Similarly, also, the spring-loaded blade 34b is pivotally attached to the second end portion 28 of bracket 21b by a hinge 39, and is urged toward the bracket first end portion 27 by spring means 34a.

FIGS. 1, 12 and 13 illustrate a corner guide 61 which may be used as a part of my invention to determine the upper level of succeeding courses of bricks 19 when constructing a wall corner 24. The corner guide 61 has a channel member 62 which is preferably substantially similar to the channels 26 of brackets 21 and 21a. The corner guide 61 also has a rod level 66 extending from the channel member 62 to guide the bricklayer or mason in determining the upper level of the course of bricks 19 or blocks being laid. A pair of bubble level indicators 35 and 36 may also be secured to the corner guide 61 by any suitable means, if desired.

The channel member 62 has a base portion 63 and side portions 64 and 65 substantially similar to those of a channel 26 of bracket 21. A spring member 69 similar to spring 32 of channel 26 extends from the inside surface of side portion 65 to engage side 22d of the straight edge 22 and maintain the inside surface of the channel side portion 64 in flush engagement with side 22b of the straight edge.

The rod level 66 extends outwardly from the rear end 65a of the channel side portion 65 and in substantially horizontal relation perpendicular to the inside surface of channel side portion 64. The rod level 66 is preferably supported by a lower support rod 67 extending from the lower end 650 of side portion 65 to the rod level 66 in a preferably vertical plane, and by a front support rod 63 extending from the front end 65b of the side portion 65 to the rod level in a preferably horizontal plane. It is of course, obvious that any type of horizontal rod level and support means may be employed with my corner guide 61, as desired.

In use, my corner guide 61 is placed on the straight edge 22 supported at a wall corner 24 in plumb relation, so that the rod level 66 extends horizontally at the desired level of the next succeeding course of bricks to be laid. The corner guide 61 is maintained in place on the straight edge by spring 69. If the straight edge 22 is plumb and the channel side portion 64 is flush against side 22b of the straight edge, the level rod 66 will be horizontal, and will serve as a guide for laying and leveling the bricks 19 at and near the corner 24 of the wall 18. Level indicators 35 and 36 provide convenient means for determining whether the rod level 66 is level. However, such indicators 35 and 36 are not essential if other means are provided for determining Whether the straight edge 22 is plumb. The corner guide 61 may be easily moved to the level of the next course of bricks by removing it from the straight edge 22 and reengaging the straight edge at the next desired level, where it will again be retained in place by the spring 69.

FIG. 5 illustrates the use of a conventional line holder 60 with my corner plumb 20 to determine the upper level of a course of bricks.

While I have referred to my invent-ion as a corner plumb, it is obvious that the brackets 21, 21a and 21b can be employed to support a straight edge 22 or level 44 adjacent to a straight wall surface, at a window or door opening, or at any other :location on a brick wall being constructed. The bracket 21b shown in FIG. 11 is especially adapted for use in the middle of a wall, as the rear portion 58 provides a narrow space between the wall and a straight edge or level through which a line level may be extended between corners of the wall.

It is also obvious that the relative dimensions of the brackets of my invention may be varied to receive a straight edge or level of any size, and may further be varied to allow the brackets'to be attached to any size masonry brick or block. Further, while the drawings show the brackets attached to the ends of such bricks or blocks, the dimensions of the brackets may be varied to permit them to be attached to the longer sides of said bricks or blocks.

My invention is described herein without limitation as to the materials employed, and any suitable rigid material may be employed in the manufacture of my corner plumb if it is capable of functioning as described herein.

It is understood that the present invention is not confined to the particular construction and arrangements of parts herein illustrated and described, but embraces all such modifications and alterations thereof as may come within the scope of the following claims.

I claim:

1. In combination, a corner plumb for use in the construction of masonry structures, comprising:

(a) an elongated straight edge member having two pairs of parallel sides,

(b) a plurality of substantially rigid brackets adapted to support said straight edge member in plumb relation with one side thereof being in planar alignment With one wall forming the corner of a structure and an adjacent side thereof being flush against the other wall forming said corner,

(c) each of said brackets having a three sided channel, first and second end portions extending from said channel, and attachment means for removably attaching said bracket to a wall corner block,

((1) said channel having a base portion and two parallel side portions, said base portion and at least one of said side portions having vertically disposed flat inner surfaces engaging flush against adjacent sides of said straight edge member,

(e) said first end portion extending from one of said channel side portions and having an inner surface which is in the same plane as the inner surface of said one of said side portions,

(f) said attachment means comprising a blade pivotably mounted on said second end portion for movement about a vertical axis and spring means for pivoting said blade toward said first end portion to detachably engage a single corner block located therebetween and support said channel and said straight edge member at a wall corner, and

(g) level indicator means on said corner plumb for determining whether said straight-edge member is plumb.

2. The invention described in claim 1 wherein said base portion of said channel is slightly longer than one pair of parallel sides of the straight edge member, and wherein a spring means is attached to the inside surface of the side portion of said channel opposite the side portion from which the bracket first end portion extends thereby to engage one side of said straight edge member between said one pair of parallel sides and force the opposite parallel side of said straight edge member flush against the channel side portion from which said end portion extends.

3. The invention described in claim 1 wherein a corner guide removably engages the straight edge, said corner guide comprising:

(a) a channel member having a base portion and a pair of substantially parallel side portions, and being adapted Q transversely encompass three adjacent sides of said straight edge such that one of said side portions is flush with one side of said straight edge, and

(b) a rigid rod level extending outwardly from one of said side portions perpendicular to said one side of said straight edge.

4. A bracket for a corner plumb for use in the construction of masonry structures comprising:

(a) a three sided channel having a base portion and two parallel side portions extending therefrom, said base portion and at least one of said side portions having vertically disposed flat inner surfaces engaging flush against adjacent sides of a straight edge member having two pairs of parallel sides,

(b) a first end portion extending from one side portion of said channel in the same plane as said one side portion,

(c) a second end portion extending from said channel,

(d) attachment means comprising a blade pivotably mounted on said second end portion for movement about a vertical axis and spring means for pivoting said blade toward said first end portion to detachably engage a single wall corner block located therebetween and support said bracket and said straight edge member at a wall corner in such a manner that one of said sides of said straight edge member is in planar alignment with one wall of said corner and another side of said straight edge member is flush against the other wall of said corner.

5. The invention described in claim 3 wherein spring means is attached to the inside surface of the channel side portion opposite the side portion from which said first end portion extends, thereby to force a straight edge member supported by said channels flush against the side portion from which said end portion extends.

6. A corner plumb for use in the construction of corner forming walls in block masonry structures comprising:

(a) an elongated straight edge member having first and second parallel sides and third and fourth parallel sides,

(b) a plurality of vertically spaced substantially rigid brackets each having a three sided channel receiving said straight edge member,

(c) said channel having a base portion having a vertically disposed fiat inner surface engaging flush against said first side of said straight edge member,

((1) said channel having spaced first and second parallel side portions rigidly attached to said base portion,

(e) said first side portion having a vertically disposed flat inner surface engaging flush against said third side of said straight edge member,

(f) resilient means mounted on said second side portion whereby said third side of said straight edge member is held tightly against the inner surface of said first side portion,

(g) said bracket having a first end portion extending from said first side portion, said first end portion having a vertically disposed flat inner surface which is co-planar with the inner surface of said first side portion whereby said third side of said straight edge member is maintained in planar alignment with one wall of a corner of said structure,

(h) said bracket having a second end portion extending transversely from said second side portion and having a flat inner surface which is co-planar with said second side of said straight edge member whereby said second side is held flush against the wall of said corner of said structure,

(i) an attaching blade mounted on said second end portion for pivotal movement about a vertical axis and spring means for pivoting said blade toward said first end portion for releasably engaging a single corner block therebetween and supporting said channel and said straight edge member at the corner formed by said walls, and

(j) level indicator means on said corner plumb for determining Whether said straight edge member is plumb.

68,555 2/1949 Denmark. 1,296,913 5/1962 France. References Cited by the Examiner 5 498,153 9/ 1954 y- UNITED STATES PATENTS LEONARD FORMAN, Primary Examiner.

4/1913 Platt 33-85 6/1925 Boggs 33-85 ROBERT B. HULL, Examiner.

$3225 10 H. N. HAROIAN, Assistant Examiner.

FOREIGN PATENTS 

1. IN COMBINATION, A CORNER PLUMB FOR USE IN THE CONSTRUCTION OF MASONRY STRUCTURES, COMPRISING: (A) AN ELONGATED STRAIGHT EDGE MEMBER HAVING TWO PAIRS OF PARALLEL SIDES, (B) A PLURALITY OF SUBSTANTIALLY RIGID BRACKETS ADAPTED TO SUPPORT SAID STRAIGHT EDGE MEMBER IN PLUMB RELATION WITH ONE SIDE THEREOF BEING IN PLANAR ALIGNMENT WITH ONE WALL FORMING THE CORNER OF A STRUCTURE AND AN ADJACENT SIDE THEREOF BEING FLUSH AGAINST THE OTHER WALL FORMING SAID CORNER, (C) EACH OF SAID BRACKETS HAVING A THREE SIDED CHANNEL, FIRST AND SECOND END PORTIONS EXTENDING FROM SAID CHANNEL, AND ATTACHMENT MEANS FOR REMOVABLY ATTACHING SAID BRACKET TO A WALL CORNER BLOCK, (D) SAID CHANNEL HAVING A BASE PORTION AND TWO PARALLEL SIDE PORTIONS, SAID BASE PORTION AND AT LEAST ONE OF SAID SIDE PORTIONS HAVING VERTICALLY DISPOSED FLAT INNER SURFACES ENGAGING FLUSH AGAINST ADJACENT SIDES OF SAID STRAIGHT EDGE MEMBER, (E) SAID FIRST END PORTION EXTENDING FROM ONE OF SAID CHANNEL SIDE PORTIONS AND HAVING AN INNER SURFACE WHICH IS IN THE SAME PLANE AS THE INNER SURFACE OF SAID ONE OF SAID SIDE PORTIONS, (F) SAID ATTACHMENT MEANS COMPRISING A BLADE PIVOTABLY MOUNTED ON SAID SECOND END PORTION FOR MOVEMENT ABOUT A VERTICAL AXIS AND SPRING MEANS FOR PIVOTING SAID BLADE TOWARD SAID FIRST END PORTION TO DETACHABLY ENGAGE A SINGLE CORNER BLOCK LOCATED THEREBETWEEN AND SUPPORT SAID CHANNEL AND SAID STRAIGHT EDGE MEMBER AT A WALL CORNER, AND (G) LEVEL INDICATOR MEANS ON SAID CORNER PLUMB FOR DETERMINING WHETHER SAID STRAIGHT-EDGE MEMBER IS PLUMB. 